378804521 has 4 divisors (see below), whose sum is σ = 379008000. Its totient is φ = 378601044.

The previous prime is 378804487. The next prime is 378804527. The reversal of 378804521 is 125408873.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378804521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378804527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98921 + ... + 102678.

It is an arithmetic number, because the mean of its divisors is an integer number (94752000).

Almost surely, 2^378804521 is an apocalyptic number.

It is an amenable number.

378804521 is a deficient number, since it is larger than the sum of its proper divisors (203479).

378804521 is a wasteful number, since it uses less digits than its factorization.

378804521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203478.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 378804521 is about 19462.9011455127. The cubic root of 378804521 is about 723.5552813822. Note that the first 3 decimals are identical.

The spelling of 378804521 in words is "three hundred seventy-eight million, eight hundred four thousand, five hundred twenty-one".